Cylinder head

Abstract

The first aspect of the present invention is a cylinder head containing a water jacket in which a passage for EGR gas is disposed, and the EGR gas passage has a hollow pipe that is disposed in the hollow pipe and through which the EGR gas passes and an end member that is formed with an insert hole into which the end of the hollow pipe is inserted and fixed. The end member has a bottom that is provided with the insert hole, a side wall that is formed continuously to the bottom, and a wedge portion that is projected outward from the outer peripheral of the side wall and includes a inclined surface facing the wall of the cylinder head and inclined to the flow direction of the EGR gas. The EGR gas passage is fixed to the cylinder head by holding the wedge portion of the end member between a fastening member for fastening the EGR gas passage to the cylinder head and the wall of the cylinder head.

The invention claimed is: 
     
       1. A cylinder head comprising an EGR gas passage in a water jacket,
 wherein the EGR gas passage comprises:
 a hollow pipe disposed in the water jacket and through which the EGR gas passes; and 
 an end member formed with an insert hole into which the end of the hollow pipe is inserted and fixed, 
 
 wherein the end member comprises:
 a bottom having the insert hole; 
 a side wall formed continuously to the bottom; and 
 a wedge portion projected outward from the outside of the side wall, and having an inclined surface facing the wall of the cylinder head and inclined to the flow direction of the EGR gas, and 
 
 wherein the EGR gas passage is fixed to the cylinder head by holding the wedge portion of the end member between a fastening member for fastening the EGR gas passage to the cylinder head and the wall of the cylinder head. 
 
     
     
       2. The cylinder head according to  claim 1 ,
 wherein the side wall comprises an inclined portion inclined to the flow direction of the EGR gas. 
 
     
     
       3. The cylinder head according to  claim 2 ,
 wherein the inclined portion of the side wall is formed by turning the side wall sharply from the outer side to the inner side of the side wall. 
 
     
     
       4. The cylinder head according to  claim 2 ,
 wherein the inclined portion of the side wall is inclined such that the outer diameter thereof becomes gradually large from the inner side to the outer side of the cylinder head. 
 
     
     
       5. The cylinder head according to  claim 1 ,
 wherein the hollow pipe comprises an inclined portion inclined to the flow direction of the EGR gas. 
 
     
     
       6. The cylinder head according to  claim 4 ,
 wherein the hollow pipe comprises an inclined portion inclined to the flow direction of the EGR gas.